hw/intc/lm32_pic.c

   1 /*
   2  *  LatticeMico32 CPU interrupt controller logic.
   3  *
   4  *  Copyright (c) 2010 Michael Walle <michael@walle.cc>
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include "qemu/osdep.h"
  21
  22 #include "hw/hw.h"
  23 #include "monitor/monitor.h"
  24 #include "hw/sysbus.h"
  25 #include "trace.h"
  26 #include "hw/lm32/lm32_pic.h"
  27 #include "hw/intc/intc.h"
  28
  29 #define TYPE_LM32_PIC "lm32-pic"
  30 #define LM32_PIC(obj) OBJECT_CHECK(LM32PicState, (obj), TYPE_LM32_PIC)
  31
  32 struct LM32PicState {
  33     SysBusDevice parent_obj;
  34
  35     qemu_irq parent_irq;
  36     uint32_t im;        /* interrupt mask */
  37     uint32_t ip;        /* interrupt pending */
  38     uint32_t irq_state;
  39
  40     /* statistics */
  41     uint64_t stats_irq_count[32];
  42 };
  43 typedef struct LM32PicState LM32PicState;
  44
  45 static void update_irq(LM32PicState *s)
  46 {
  47     s->ip |= s->irq_state;
  48
  49     if (s->ip & s->im) {
  50         trace_lm32_pic_raise_irq();
  51         qemu_irq_raise(s->parent_irq);
  52     } else {
  53         trace_lm32_pic_lower_irq();
  54         qemu_irq_lower(s->parent_irq);
  55     }
  56 }
  57
  58 static void irq_handler(void *opaque, int irq, int level)
  59 {
  60     LM32PicState *s = opaque;
  61
  62     assert(irq < 32);
  63     trace_lm32_pic_interrupt(irq, level);
  64
  65     if (level) {
  66         s->irq_state |= (1 << irq);
  67         s->stats_irq_count[irq]++;
  68     } else {
  69         s->irq_state &= ~(1 << irq);
  70     }
  71
  72     update_irq(s);
  73 }
  74
  75 void lm32_pic_set_im(DeviceState *d, uint32_t im)
  76 {
  77     LM32PicState *s = LM32_PIC(d);
  78
  79     trace_lm32_pic_set_im(im);
  80     s->im = im;
  81
  82     update_irq(s);
  83 }
  84
  85 void lm32_pic_set_ip(DeviceState *d, uint32_t ip)
  86 {
  87     LM32PicState *s = LM32_PIC(d);
  88
  89     trace_lm32_pic_set_ip(ip);
  90
  91     /* ack interrupt */
  92     s->ip &= ~ip;
  93
  94     update_irq(s);
  95 }
  96
  97 uint32_t lm32_pic_get_im(DeviceState *d)
  98 {
  99     LM32PicState *s = LM32_PIC(d);
 100
 101     trace_lm32_pic_get_im(s->im);
 102     return s->im;
 103 }
 104
 105 uint32_t lm32_pic_get_ip(DeviceState *d)
 106 {
 107     LM32PicState *s = LM32_PIC(d);
 108
 109     trace_lm32_pic_get_ip(s->ip);
 110     return s->ip;
 111 }
 112
 113 static void pic_reset(DeviceState *d)
 114 {
 115     LM32PicState *s = LM32_PIC(d);
 116     int i;
 117
 118     s->im = 0;
 119     s->ip = 0;
 120     s->irq_state = 0;
 121     for (i = 0; i < 32; i++) {
 122         s->stats_irq_count[i] = 0;
 123     }
 124 }
 125
 126 static bool lm32_get_statistics(InterruptStatsProvider *obj,
 127                                 uint64_t **irq_counts, unsigned int *nb_irqs)
 128 {
 129     LM32PicState *s = LM32_PIC(obj);
 130     *irq_counts = s->stats_irq_count;
 131     *nb_irqs = ARRAY_SIZE(s->stats_irq_count);
 132     return true;
 133 }
 134
 135 static void lm32_print_info(InterruptStatsProvider *obj, Monitor *mon)
 136 {
 137     LM32PicState *s = LM32_PIC(obj);
 138     monitor_printf(mon, "lm32-pic: im=%08x ip=%08x irq_state=%08x\n",
 139             s->im, s->ip, s->irq_state);
 140 }
 141
 142 static void lm32_pic_init(Object *obj)
 143 {
 144     DeviceState *dev = DEVICE(obj);
 145     LM32PicState *s = LM32_PIC(obj);
 146     SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
 147
 148     qdev_init_gpio_in(dev, irq_handler, 32);
 149     sysbus_init_irq(sbd, &s->parent_irq);
 150 }
 151
 152 static const VMStateDescription vmstate_lm32_pic = {
 153     .name = "lm32-pic",
 154     .version_id = 2,
 155     .minimum_version_id = 2,
 156     .fields = (VMStateField[]) {
 157         VMSTATE_UINT32(im, LM32PicState),
 158         VMSTATE_UINT32(ip, LM32PicState),
 159         VMSTATE_UINT32(irq_state, LM32PicState),
 160         VMSTATE_UINT64_ARRAY(stats_irq_count, LM32PicState, 32),
 161         VMSTATE_END_OF_LIST()
 162     }
 163 };
 164
 165 static void lm32_pic_class_init(ObjectClass *klass, void *data)
 166 {
 167     DeviceClass *dc = DEVICE_CLASS(klass);
 168     InterruptStatsProviderClass *ic = INTERRUPT_STATS_PROVIDER_CLASS(klass);
 169
 170     dc->reset = pic_reset;
 171     dc->vmsd = &vmstate_lm32_pic;
 172     ic->get_statistics = lm32_get_statistics;
 173     ic->print_info = lm32_print_info;
 174 }
 175
 176 static const TypeInfo lm32_pic_info = {
 177     .name          = TYPE_LM32_PIC,
 178     .parent        = TYPE_SYS_BUS_DEVICE,
 179     .instance_size = sizeof(LM32PicState),
 180     .instance_init = lm32_pic_init,
 181     .class_init    = lm32_pic_class_init,
 182     .interfaces = (InterfaceInfo[]) {
 183         { TYPE_INTERRUPT_STATS_PROVIDER },
 184         { }
 185     },
 186 };
 187
 188 static void lm32_pic_register_types(void)
 189 {
 190     type_register_static(&lm32_pic_info);
 191 }
 192
 193 type_init(lm32_pic_register_types)